Heads-up display for displaying a partial pressure of oxygen to a diver

Abstract

A heads-up display has a display panel which displays information related to a partial pressure of oxygen in a breathing gas. The display panel comprises a first indicia, a second indicia, a third indicia, and a fourth indicia. The first indicia and the fourth indicia respectively indicate a near hyperoxic condition and a near hypoxic condition. The second indicia and the third indicia together indicate the partial pressure of oxygen in the breathing gas.

What is claimed is: 
     
       1. A heads-up display having a display panel which displays information related to a partial pressure of oxygen in a breathing gas, the display panel being in communication with a microprocessor which receives signals from oxygen sensors and the display panel comprising:
 a first indicia; 
 a second indicia; 
 a third indicia; and 
 a fourth indicia, wherein the microprocessor drives the display panel to display information related to the partial pressure of oxygen in breathing gas based on signals received from the oxygen sensors, the first indicia and the fourth indicia respectively indicate a near hyperoxic condition and a near hypoxic condition, and the second indicia and the third indicia together indicate the partial pressure of oxygen in the breathing gas; and 
 wherein when the partial pressure of oxygen in the breathing gas is above 1.0 bar, the third indicia is on and the second indicia flashes in a cycle, with each flash in the cycle indicating that the partial pressure of oxygen in the breathing gas is 0.1 bar above 1.0 bar; and wherein when the partial pressure of oxygen in the breathing gas is below 1.0 bar, the second indicia is on and the third indicia flashes in a cycle, with each flash in the cycle indicating that the partial pressure of oxygen in the breathing gas is 0.1 bar below 1.0 bar. 
 
     
     
       2. The heads-up display as claimed in  claim 1  wherein the first indicia flashes to indicate the near hyperoxic condition. 
     
     
       3. The heads-up display as claimed in  claim 1  wherein the fourth indicia flashes to indicate the near hypoxic condition. 
     
     
       4. The heads-up display as claimed in  claim 1  wherein when the partial pressure of oxygen in the breathing gas is 1.0 bar, the second indicia is on and the third indicia is on. 
     
     
       5. The heads-up display as claimed in  claim 1  wherein when the partial pressure of oxygen in the breathing gas is 1.0 bar, the second indicia and the third indicia each simultaneously flash once. 
     
     
       6. The heads-up display as claimed in  claim 1  wherein the heads-up display further includes a warning light to alert others to the near hyperoxic condition or the near hypoxic condition. 
     
     
       7. A heads-up display having a display panel which displays information related to a partial pressure of oxygen in a breathing gas, the display panel being in communication with a microprocessor which receives signals from oxygen sensors and the display panel comprising:
 a top indicia; 
 a middle top indicia; 
 a middle bottom indicia; and 
 a bottom indicia, wherein the microprocessor drives the display panel to display information related to the partial pressure of oxygen in breathing gas based on signals received from the oxygen sensors, the top indicia and the bottom indicia respectively and individually indicate a near hyperoxic condition and a near hypoxic condition, and the middle top indicia and the middle bottom indicia together indicate the partial pressure of oxygen in the breathing gas; and 
 wherein when the partial pressure of oxygen in the breathing gas is above 1.0 bar, the middle bottom indicia is on and the middle top indicia flashes in a cycle, with each flash in the cycle indicating that the partial pressure of oxygen in the breathing gas is 0.1 bar above 1.0 bar; and wherein when the partial pressure of oxygen in the breathing gas is below 1.0 the middle top indicia is on and the middle bottom indicia flashes in a cycle, with each flash in the cycle indicating that the partial pressure of oxygen in the breathing gas is 0.1 bar below 1.0 bar. 
 
     
     
       8. The heads-up display as claimed in  claim 7  wherein the top indicia flashes to indicate the near hyperoxic condition. 
     
     
       9. The heads-up display as claimed in  claim 7  wherein the bottom indicia flashes to indicate the near hypoxic condition. 
     
     
       10. The heads-up display as claimed in  claim 7  wherein when the partial pressure of oxygen in the breathing gas is 1.0 bar, the middle top indicia is on and the middle bottom indicia is on. 
     
     
       11. The heads-up display as claimed in  claim 7  wherein when the partial pressure of oxygen in the breathing gas is 1.0 bar, the middle top indicia and the middle bottom indicia each simultaneously flash once. 
     
     
       12. The heads-up display as claimed in  claim 7  wherein the heads-up display further includes a warning light to alert others to the near hyperoxic condition or the near hypoxic condition.